SMS Audio Bio Sport Earbud with Heart Monitor - Black/Grey" Description: "Experience superior sound quality on the go with the SMS Audio Bio Sport Earbud. These earbuds are professionally tuned with 12mm drivers to deliver crisp vocals, tight bass, and dynamic mid-tones, giving you the studio-mastered sound wherever you are. Track your heart rate in real-time without the hassle of uncomfortable straps or multiple devices. The built-in heart rate monitor allows you to monitor your heart rate while listening to your favorite tracks. Whether you're hitting the gym or going for a run, these earbuds are built to withstand sweat and water with its IPX4-rating. So you can dive into your workouts without worrying about damaging your earbuds. Forget about replacing or recharging batteries, the 3.5 mm gold-plated audio jack provides all the power you need for biometric monitoring. Stay on track and in shape with compatibility with major fitness apps like Run Keeper. With the SMS Audio Bio Sport Earbuds, you can track your results and achieve your fitness goals with ease. - Professionally tuned 12mm drivers for superior sound quality - Built-in heart rate monitor for real-time tracking - IPX4-rated for resistance to sweat and water - No need for batteries, powered by the 3.5mm audio jack - Compatible with major fitness apps like Run Keeper